Whoever said that being a 30 something was the new 20 something should fuck right off.

EDIT: Interesting fact for those of you with a medical bent; while aerobic exercise will help you burn off fat and such while you're running, working large muscle groups (legs, ass, back, chest) will increase your body's metabolic rate for long period of time after you're workout is over so you' re burning off more calories in the long run. Neato, eh?